Journal of Powder Materials

Min-Ku Lee

9 Articles

Dispersion Behaviors of Y₂O₃ Particles Into Aisi 316L Stainless Steel by Using Laser Cladding Technology: Eun-Kwang Park, Sung-Mo Hong, Jin-Ju Park, Min-Ku Lee, Chang-Kyu Rhee, Kyeong-Won Seol, Yang-Kyu Lee; J Korean Powder Metall Inst. 2013;20(4):269-274.; DOI: https://doi.org/10.4150/KPMI.2013.20.4.269

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The present work investigated the dispersion behavior of Y_2O_3 particles into AISI 316L SS manufactured using laser cladding technology. The starting particles were produced by high energy ball milling in 10 min for prealloying, which has a trapping effect and homogeneous dispersion of Y_2O_3 particles, followed by laser cladding using CO_2 laser source. The phase and crystal structures of the cladded alloys were examined by XRD, and the cross section was characterized using SEM. The detailed microstructure was also studied through FE-TEM. The results clearly indicated that as the amount of Y_2O_3 increased, micro-sized defects consisted of coarse Y_2O_3 were increased. It was also revealed that homogeneously distributed spherical precipitates were amorphous silicon oxides containing yttrium. This study represents much to a new technology for the manufacture and maintenance of ODS alloys.

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Flexible Post-Process Machining of the Directed Energy Deposition (DED) Printed Part through the On-Machine Measurement
Hoon-Hee Lee, Min-Suk Park, Dong-Mok Lee, Seung-Han Yang
Journal of the Korean Society for Precision Engineering.2020; 37(12): 881. CrossRef
Microstructure and Room Temperature Wear Properties of a Ni-Cr-B-Si-C Coating Layer Manufactured by the Laser Cladding Process
Tae-Hoon Kang, Kyu-Sik Kim, Soon-Hong Park, Kee-Ahn Lee
Korean Journal of Metals and Materials.2018; 56(6): 423. CrossRef
Manufacturing of Ni-Cr-B-Si + WC/12Co Composite Coating Layer Using Laser Cladding Process and its Mechanical Properties
Gi-Su Ham, Chul-O Kim, Soon-Hong Park, Kee-Ahn Lee
Journal of Korean Powder Metallurgy Institute.2017; 24(5): 370. CrossRef

An Investigation of the Stability of Y₂O₃ and Sintering Behavior of Fe-Based ODS Particles Prepared by High Energy Ball Milling: Eun-Kwang Park, Sung-Mo Hong, Jin-Ju Park, Min-Ku Lee, Chang-Kyu Rhee, Kyeong-Won Seol; J Korean Powder Metall Inst. 2013;20(4):275-279.; DOI: https://doi.org/10.4150/KPMI.2013.20.4.275

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Fe-based oxide dispersion strengthened (ODS) powders were produced by high energy ball milling, followed by spark plasma sintering (SPS) for consolidation. The mixed powders of 84Fe-14Cr-2Y_2O_3 (wt%) were mechanically milled for 10 and 90 mins, and then consolidated at different temperatures (900sim1100°C). Mechanically-Alloyed (MAed) particles were examined by means of cross-sectional images using scanning electron microscopy (SEM). Both mechanical alloying and sintering behavior was investigated by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HR-TEM). To confirm the thermal behavior of Y_2O_3, a replica method was applied after the SPS process. From the SEM observation, MAed powders milled for 10 min showed a lamella structure consisting of rich regions of Fe and Cr, while both regions were fully alloyed after 90 min. The results of sintering behavior clearly indicate that as the SPS temperature increased, micro-sized defects decreased and the density of consolidated ODS alloys increased. TEM images revealed that precipitates smaller than 50 nm consisted of YCrO_3.

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Effect of Y2O3 on Mechanical and Corrosion Properties of Fe and Fe-Ni Alloys Prepared by Mechanical Alloying Followed by Spark Plasma Sintering
Arpan Arora, Atul Kumar, Suhrit Mula
Journal of Materials Engineering and Performance.2021; 30(2): 1387. CrossRef
Synthesis and Microstructure of Fe-Base Superalloy Powders with Y-Oxide Dispersion by High Energy Ball Milling
다미 임, 종관 박, 승탁 오
Korean Journal of Materials Research.2015; 25(8): 386~390. CrossRef

Effect of B₄C Content on the Sintering Characteristics of 6061Al-B₄C Composite Powder: Jin-Ju Park, Sung-Mo Hong, Kyoung-Yeol Kim, Min-Ku Lee, Chang-Kyu Rhee, Won-Hyuk Rhee, Yang Kyu Lee; J Korean Powder Metall Inst. 2013;20(3):215-220.; DOI: https://doi.org/10.4150/KPMI.2013.20.3.215

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Abstract PDF: In the present work, 6061 Al-B_4C sintered composites containing different B_4C contents were fabricated and their characteristic were investigated as a function of sintering temperature. For this, composite powders and their compacts with B_4C various contents from 0 to 40 wt.% were fabricated using a planetary ball milling equipment and cold isostatic pressing, respectively, and then they were sintered in the temperature ranges of 580 to 660°C. Above sintering temperature of 640°C, real density was decreased due to the occurrence of sweat phenomena. In addition, it was realized that sinterability of 6061Al-B_4C composite material was lowered with increasing B_4C content, resulting in the decrease in its real density and at the same time in the increment of porosity.

Milling Behaviors of Al-B₄C Composite Powders Fabricated by Mechanical Milling Process: Sung-Mo Hong, Jin-Ju Park, Eun-Kwang Park, Min-Ku Lee, Chang-Kyu Rhee, Ju-Myoung Kim, Jin-Kyu Lee; J Korean Powder Metall Inst. 2012;19(4):291-296.; DOI: https://doi.org/10.4150/KPMI.2012.19.4.291

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In the present work, Al-B_4C composite powders were fabricated using a mechanical milling process and its milling behaviors and mechanical properties as functions of B_4C sizes ( 100µm, 500 nm and 50 nm) and concentrations (1, 3 and 10 wt.%) were investigated. For achieving it, composite powders and their compacts were fabricated using a planetary ball mill machine and magnetic pulse compaction technology. Al-B_4C composite powders represent the most uniform dispersion at a milling speed of 200 rpm and a milling time of 240 minutes. Also, the smaller B_4C particles were presented, the more excellent compositing characteristics are exhibited. In particular, in the case of the 50 nm B_4C added compact, it showed the highest values of compaction density and hardness compared with the conditions of 100µm and 500 nm additions, leading to the enhancement its mechanical properties.

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Influence of high B4C contents on structural evolution of Al-B4C nanocomposite powders produced by high energy ball milling
Hao Guo, Yu Zhao, Songsong Xu, Junpeng Li, Naimeng Liu, Yang Zhang, Zhongwu Zhang
Ceramics International.2019; 45(5): 5436. CrossRef
Effect of B4C Content on the Sintering Characteristics of 6061Al-B4C Composite Powder
Jin-Ju Park, Sung-Mo Hong, Kyoung-Yeol Kim, Min-Ku Lee, Chang-Kyu Rhee, Won-Hyuk Rhee, Yang Kyu Lee
Journal of Korean Powder Metallurgy Institute.2013; 20(3): 215. CrossRef

Quantitative Study on the Refinement Behaviors of TiC Powders Produced by Mechanical Milling Under Different Impact Energy: Sung-Mo Hong, Eun-Kwang Park, Kyeong-Yeol Kim, Jin-Ju Park, Min-Ku Lee, Chang-Kyu Rhee, Jin-Kyu Lee, Young-Soon Kwon; J Korean Powder Metall Inst. 2012;19(1):32-39.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.032

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This study investigated refinement behaviors of TiC powders produced under different impact energy conditions using a mechanical milling process. The initial coarse TiC powders with an average diameter of 9.3 µm were milled for 5, 20, 60 and 120 mins through the conventional low energy mechanical milling (LEMM, 22G) and specially designed high energy mechanical milling (HEMM, 65G). TiC powders with angular shape became spherical one and their sizes decreased as the milling time increased, irrespective of milling energy. Based upon the FE-SEM and BET results of milled powders, it was found initial coarse TiC powders readily became much finer near 100 nm within 60 min under HEMM, while their sizes were over 200 nm under LEMM, despite the long milling time of up to 120 min. Particularly, ultra-fine TiC powders with an average diameter of 77 nm were fabricated within 60 min in the presence of toluene under HEMM.

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Compaction and Sintering Characteristics of High Energy Ball Milled Mn-Zn Ferrite Powders
Hyunseung Lee, Hoseong Rhee, Sangsoo Lee, Si Young Chang
Korean Journal of Materials Research.2021; 31(12): 677. CrossRef
Fabrication of titanium carbide nano-powders by a very high speed planetary ball milling with a help of process control agents
Sung-Mo Hong, Jin-Ju Park, Eun-Kwang Park, Kyeong-Youl Kim, Jung-Gu Lee, Min-Ku Lee, Chang-Kyu Rhee, Jin Kyu Lee
Powder Technology.2015; 274: 393. CrossRef
Control of Y2O3 phase and its nanostructure formation through a very high energy mechanical milling
M.K. Lee, E.K. Park, J.J. Park, C.K. Rhee
Journal of Solid State Chemistry.2013; 201: 56. CrossRef
Fabrication of Fe coated Mg Based Desulfurization Powder by Mechanical Alloying Process
Joon-Woo Song, Otaduy Guillermo, Byong-Sun Chun, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2012; 19(3): 226. CrossRef
Synthesis and structural properties of Ni–20Cr–2Y2O3 nanocomposite alloy prepared by a very high energy mechanical milling
M.K. Lee, J.J. Park, C.K. Rhee
Materials Chemistry and Physics.2012; 137(1): 129. CrossRef

Size Control of Bismuth Nanoparticles by Changes in Carrier-Gas Flow Rate and Chamber Pressure of Gas Condensation Apparatus: Gyoung-Ja Lee, Chang-Kyu Kim, Min-Ku Lee, Chang-Kyu Rhee; J Korean Powder Metall Inst. 2010;17(5):379-384.; DOI: https://doi.org/10.4150/KPMI.2010.17.5.379

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Abstract PDF: In the present work, bismuth nanopowders with various particle size distributions were synthesized by controlling argon (Ar) gas flow rate and chamber pressure of a gas condensation (GC) apparatus. From the analyses of transmission electron microscopy (TEM) images and nitrogen gas adsorption results, it was found that as Ar gas flow rate increased, the specific surface area of bismuth increased and the average particles size decreased. On the other hand, as the chamber pressure increased, the specific surface area of bismuth decreased and the average particles size increased. The optimum gas flow rate and chamber pressure for the maximized electrochemical active surface area were determined to be 8 L/min and 50 torr, respectively. The bismuth nanopowders synthesized at the above condition exhibit 13.47 m2g-1 of specific surface area and 45.6 nm of average particles diameter.

Response Characteristics of Electrochemical Non-enzyme Immunosensor using Fe₃O₄ Nanoparticle: Chang-Kyu Kim, Gyoung-Ja Lee, Young-Rang Uhm, Min-Ku Lee, Chang-Kyu Rhee; J Korean Powder Metall Inst. 2009;16(3):180-184.; DOI: https://doi.org/10.4150/KPMI.2009.16.3.180

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Abstract PDF: In this paper, the electrochemical non-enzyme immunosensor has been developed for the determination of salmonella antigen, using inverse voltammetry. For the estimation of salmonella antigen concentration, the Fe_3O_4 nanoparticles synthesized by microemulsion method were conjugated with salmonella antigen. Then, the immunocomplex between antibody immobilized on the transducer surface and antigen containing a magnetic nanoparticles was formed. From the linear relationship between the reduction peak current of Fe(III) and salmonella antigen concentration, it is suggested that the electrochemical non-enzyme biosensor is applicable to detect salmonella antigen in the concentration range of 101-105 CFU/ml.

A Study on Detection Characteristics of Cadmium and Lead for Bi Nanopowder-Labeled Electrode: Gyeoung-Ja Lee, Hyoun-Jin Kim, Hi-Min Lee, Sang-Hoon Lee, Min-Ku Lee, Chang-Kyu Lee; J Korean Powder Metall Inst. 2008;15(5):393-398.; DOI: https://doi.org/10.4150/KPMI.2008.15.5.393

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Abstract PDF: Trace analysis of Cd and Pb at surface modified thick film graphite electrode with Bi nanopowder has been carried out using square-wave anodic stripping voltammetry (SWASV) technique. Bi nanopowder synthesized by gas condensation (GC) method showed the size of 50sim100 nm with BET surface area, A_BET=6.8m2g-l. For a strong adhesion of the Bi nanopowder onto the screen printed carbon paste electrode, nafion solution was added into Bi-containing suspension. From the SWASV, it was found that the Bi nanopowder electrode exhibited a well-defined responses relating to the oxidations of Cd and Pb. The current peak intensity increased with increasing concentration of Cd and Pb. From the linear relationship between Cd/Pb concentrations and peak current, the sensitivity of the Bi nanopowder electrode was quantitatively estimated. The detection limit of the electrode was estimated to be 0.15µg/l and 0.07µg/l for Cd and Pb, respectively, on the basis of the signal-to-noise characteristics (S/N=3) of the response for the 1.0µg/l solution under a 10 min accumulation.

Self-repairing Technology by Electrophoresis of Ni Nano-Particles for Heat Exchanger Tubes: Gyoung-Ja Lee, Min-Ku Lee, Chang-Kyu Rhee; J Korean Powder Metall Inst. 2007;14(4):238-244.; DOI: https://doi.org/10.4150/KPMI.2007.14.4.238

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The electrophoretic deposition process of Ni nano-particles in organic suspension was employed for self-repairing of heat exchanger tubes. For this purpose, Ni nano-particles prepared by levitational gas condensation method were dispersed into the solution of ethanol with the addition of dispersant Hypermer KD2. For electrophoretic deposition of Ni nano-particles on the Ni alloy specimen, constant electric fields of 20 and 100 V cm-1 were applied to the specimen in Ni-dispersed solution. It was found that as electrophoretic deposition proceeds, the size of the pit or crack remarkably decreased due to the agglomeration of Ni nano-particles at the pit or crack. This strongly suggests that the electrophoretic mobility of the charged particles is larger for the damaged part with a higher current value rather than outer surfaces with a lower current value.

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Electrophoretic deposition of Ni nanoparticles from suspension on to a Ni plate
Keun-Yong Park, Young Rang Uhm, Kwang Jae Son, Deok-Yong Park
Research on Chemical Intermediates.2015; 41(9): 6721. CrossRef

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